Hot Cams Stage 2 please help

so i just bought stage 2 hotcams for my kx250f 2007 and i already have a high compression piston in the bike i was wondering, do i need new springs? also on the instructions it says the valve lash/clearance has to be set differently then stock anyone know if this is to be true? lastly because of the high compression piston are the valves going to hit the top of the piston?? please helppp

I have hot cams in my 07 also. Valve lash is still .1~.15in and .17~22ext they don't require new valve springs.

thank you so much


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